Why would Christopher Marlowe be the one and only one that can have written Shakespeare's plays?Can you state a few reasons for this? This is for...

They are not related in any way to each other. Marlowe was
an aristocrat, upper crust artist with a penchant for self-destruction. He was snobby, a
dandy, an alcoholic, a wild man, a brawler, an addict, and also an incredibly talented
man.

Shakespeare, born the same year as Marlowe, was from
humble beginnings, not college-educated like Marlowe, certainly less wealthy, and did
not have the demons that haunted Marlowe.

Marlovian theory
states that Marlowe must have been the writer behind Shakespeare's writings because
Shakespeare's past, upbringing, personality, education, and temperament does not render
him as an artist in any way. He was, in fact, a lawyer and accountant.  How in the world
could this man have written Romeo and Juliet? That is a theory,
though.

So, since Marlowe was so bad, and had so many
enemies everywhere, he had to escape his imminent death penalty which he was about to
get for acts of heresy and much more, actually. He supposedly faked his death (someone
falsely claimed to have murdered him and helped him
escape).

Once gone away from creditors, the police, the
kingdom, enemies, boyfriends, and all that haunted him, Marlowe presumably kept writing
from afar and sending his documents under the name of William
Shakespeare.

HOWEVER: The reason why the theory is so
contagious is because Marlowe and Shakespeare indeed have many similarities in style of
writing, themes, choice of words, rhythm, vocabulary usage, and just the essence of
their writings are strikingly similar.  They also have some differences that people
won't admit to for fanatical reasons,
though.

• Shakespeare then "coincidentially" shows
  up in the theatre scene the very year after the supposed death of Marlowe.
  


• They were contemporaries, as they were the same age.
  


• They must have known each other since the theatre scene
  was so small.


• Marlovian theory basically states: It is
  more likely that Marlowe wrote Shakespeare's works, even more like than Shakespeare
  writing Shakespeare's works.

Read the link I
included in the answer. It has more information on why Marlowe, and not any other
author, would have possibly written these works.